Same device with a different screen.
No. That isn't true. There are 2 other important differences.
On is a BIG reason to prefer Zip over Plus unrelated to the screen.
A different POWER BUTTON SWITCH. The Clip+ one is defective.
I've now had *three* count em *three* Clip+ failures in my family.
All because the power button stopped working, the switch separated from the PCB. The force is at right angles to the solder joints and it isn't mechanically sound.
You can still turn them on by plugging them into the power cable...
Third reason: Micro USB on the Zip vs Mini USB on the +.
So:
Factor (a): Which screen do you prefer.
Factor (b): Do you want to share charger cables with a cell phone.
Factor (c): Do you mind replacing it every year.